I liked the ambiance but for me it's too difficult. I couldn't get passed the first zombie, since it's too dark for me to see much, even with the flashlight on. The zombies were incredibly fast too. A blink and they appeared and disappeared. If I hadn't watched your discord video, I would have had no idea why I kept dying.
But I do have some vision problems so it's probably just me. Maybe consider adding difficulty levels, with a few easier settings and a few harder settings.
But from the discord video the story sounds great, and I'd watch a whole playthrough just to see how the story turns out.
The full screen version of the browser version didn't respond to either my gamepad or mouse or keyboard, but the window browser version was responsive. The gamepad didn't seem to work for the menu. The mouse seemed off for the menu too. I have to aim the to have the top of the cursor over start rather than the center of the cursor.
After the menu screen I played using a gamepad and it was very responsive and worked as expected. I didn't try the keyboard or mouse. The instructions below the game about controls definitely helped me out.